Cigarette filter



FIG. 1 is a front, bottom and left side perspective view of a cigarette filter, showing our new design;

FIG. 2 is a rear, top, and right side perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is an enlarged top plan view thereof;

FIG. 8 is an enlarged bottom plan view thereof; and,

FIG. 9 is a use state perspective view thereof.

The broken lines in FIG. 9 is directed to environment and form no part of the claimed design. 

CLAIM The ornamental design for a cigarette filter, as shown and described. 